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SystemStackError?

while im trying a couple of codes from the book, i tried to open a page, and it successfully loaded, then, when i refreshed, an error now showsSystemStackError: stack level too deep: SELECT * FROM categories WHERE (categories.id = 1) LIMIT 1
what is this?i tried to undo some of the steps i've done, but with no luck, i can't fix this. there are two errors actually, 1 is the above code, the other is something like a connection to mysql is lost, somthing like that. i really can't fix this for i am a newb in RoR. thanks in advance.